I use Firebind to check for port accesses for my other games. For GW2, I’ve noticed a lot of people are stuck in the process to identify if a port is open or closed in their node.
http://www.firebind.com/tests/
Can someone from the GW2 team validate / talk to the people at Firebind and have a profile / test set up for this game? You can see most popular games have their own test app in the link above.
Z